Heritage language learning, or heritage language acquisition, is the act of learning a heritage language from an ethnolinguistic group that traditionally speaks the language, or from those whose family historically spoke the language. According to a commonly accepted definition by Valdés, heritage languages are generally minority languages in society and are typically learned at home during childhood. When a heritage language learner grows up in an environment with a dominant language that is different from their heritage language, the learner appears to be more competent in the dominant language and often feels more comfortable speaking in that language. "Heritage language" may also be referred to as "community language," "home language," and "ancestral language". There are different kinds of heritage language learners, such as learners with varying levels of proficiency in the heritage language, and also those who learn a "foreign" language in school with which they have some connection. Polinsky & Kagan label heritage language learners on a continuum that ranges from fluent speakers to individuals who speak very little of their heritage language. Valdés points out that a connection with a heritage language does not have to be made only through direct previous exposure to the language or a certain amount of proficiency in the language. In her conception of heritage language learners, monolingual English-speaking students of Armenian ancestry in the United States could consider themselves to have a heritage language of Armenian. A different definition of heritage language learners or speakers limits the term to individuals who were exposed to the language in early childhood, but who later lost proficiency in the language in favor of adopting the majority language of the community. Heritage languages can be learned in various contexts, including public school instruction and language courses organized by a community which speaks the particular language during after-school hours or on the weekend. When someone is engaged in informal heritage language learning, they are acquiring a language from a particular ethnolinguistic group that traditionally speaks the language, or from someone whose family historically spoke the language. Formal heritage language instruction occurs inside of a classroom, where learners are taught a language that is being used inside of the home or among members of their own ethnic group. Language programs that include Saturday schools and courses that happen outside of school hours are programs where children are encouraged to further develop and improve their heritage language proficiency. According